In 5.0.1, how do I make REPL printing in both DrRacket Interactions and
the command-line REPL use the shared structure format?
In DrRacket, I cannot seem to do this regardless of whether the "Show
sharing in values" is true, and whether "Output Style" is "write" or
"print".
> (print-graph #t) ; just to show that this does not seem to affect the
REPL
> (define x (let ((tail '(tail))) `((a , at tail) (b , at tail))))
> x
((a tail) (b tail))
> (parameterize ((print-graph #t)) (format "~S" x))
"((a . #0=(tail)) (b . #0#))"
>
I want to see the shared structure format, since I have some library
code that uses shared list tails heavily to save space and to shortcut
some searches.
I believe that PLT 3xx, at least, used shared structure format by default.
--
http://www.neilvandyke.org/